Re: GRE tunneling

after you have configured the static route for netA to use tunnel GRE 10.

if a packet for netA arrives on the router on some interface the router will:

encapsulate the packet inside a GRE header using tunnel source and tunnel destination

the resulting GRE/IP packet will be routed using the tunnel destination: routed as any other packet with a destination = GRE tunnel destination

for the static route to be used the GRE tunnel must be up/up and it is if tunnel destination is known (unless you configure GRE keepalives if supported in that case the interface GRE tunnel is up if communication is effective )

Re: GRE tunneling

"In between" routers treat GRE packets just like any other IP packet. Only the tunnel endpoints devices treat a GRE packet special as they deal with encapsulation but when not doing so they also treat a GRE packet like other IP packets. (For instance, when the GRE packet is placed for outbound routing on the tunnel source device.)

Re: GRE tunneling

Question
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Symptoms
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